<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, user-scalable=no">
    <meta http-equiv="X-UA-Compatible" content="ie=edge,chrome=1">
    <meta name="author" content="杨宁争">
    <title></title>
    <style>
    *{
        box-sizing: border-box;
    }
        ul{
            margin: 0;
            padding: 0;
            list-style: none;
        }
        img{
            width: 168px;
            height: 180px;
             border: 1px solid orange;
            opacity: 0.5;

        }
        .main{
            width: 920px;
            height: 406px;
            border: 1px solid gold;
            margin: 60px auto;
           
        }
        ul{
             width: 880px;
            height: 366px;
             display: flex;
            flex-wrap: wrap;
            justify-content: space-around;
            margin: 20px 20px 20px 20px;
        }
        img:hover{
            
            opacity: 1;
        }
    </style>
</head>
<body>
   <div class="main">   
        <ul class="img">
            <li><img src="big_1.jpg" alt=""></li>
            <li><img src="big_2.jpg" alt=""></li>
            <li><img src="big_3.jpg" alt=""></li>
            <li><img src="big_4.jpg" alt=""></li>
            <li><img src="big_5.jpg" alt=""></li>
            <li><img src="big_6.jpg" alt=""></li>
            <li><img src="big_7.jpg" alt=""></li>
            <li><img src="big_8.jpg" alt=""></li>
            <li><img src="big_9.jpg" alt=""></li>
            <li><img src="big_10.jpg" alt=""></li>
        </ul>
    </div>
</body>
</html>